On a hardtail, get two pairs of the anywhere mounts from SKS or WT. Experiment with them before sticking them down, angling the lower bottle to the left and the upper bottle to the right (opposite if you want left hand access to upper bottle). The lower nozzle will “overlap” the upper bottle. You’ll be able to get two ~600-650 ml bottles inside the downtube on most medium and larger frames, and a small plus regular bottle inside the downtube on smaller frames. You may also be able to get one on the seatpost on larger frames with an anything mount and it can be offset/angled as well, just watch for calf strike possibilities. My medium gravel bike fits three this way. On a FS get the WT double bottle mounts on a B-rad base and run the cages as low as possible. You may occasionally have inner knee strikes on the cages, depending on what you use, but imho it’s a small price to pay to carry 1.2 litres on the bike. Final tip: if you wear the bibs with pockets on the back, stuff a 500 ml soft bottle with a pop top in the centre pocket. I found that two soft bottles is too much in bib pockets. Bonus tip: freeze the soft bottle for hot rides, warm it for cool rides. That’s 1.7 litres, good for rides up to 3 hours, ymmv.
July 21, 2022, 3:37 p.m. - Daniel Rahrer
On a hardtail, get two pairs of the anywhere mounts from SKS or WT. Experiment with them before sticking them down, angling the lower bottle to the left and the upper bottle to the right (opposite if you want left hand access to upper bottle). The lower nozzle will “overlap” the upper bottle. You’ll be able to get two ~600-650 ml bottles inside the downtube on most medium and larger frames, and a small plus regular bottle inside the downtube on smaller frames. You may also be able to get one on the seatpost on larger frames with an anything mount and it can be offset/angled as well, just watch for calf strike possibilities. My medium gravel bike fits three this way. On a FS get the WT double bottle mounts on a B-rad base and run the cages as low as possible. You may occasionally have inner knee strikes on the cages, depending on what you use, but imho it’s a small price to pay to carry 1.2 litres on the bike. Final tip: if you wear the bibs with pockets on the back, stuff a 500 ml soft bottle with a pop top in the centre pocket. I found that two soft bottles is too much in bib pockets. Bonus tip: freeze the soft bottle for hot rides, warm it for cool rides. That’s 1.7 litres, good for rides up to 3 hours, ymmv.